What is the CVSS score of CVE-2026-2460?

CVE-2026-2460 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. EPSS exploitation probability: 0.0%.

How to fix or mitigate CVE-2026-2460?

Within 24 hours: Inventory all REB500 deployments, identify users with low-privilege accounts, and disable DAC protocol access if operationally feasible. Within 7 days: Implement network segmentation to restrict REB500 access to trusted administrative networks only, and enable enhanced logging on all DAC protocol activities for forensic review. Within 30 days: Contact the vendor for patch availability, plan system upgrades, and conduct a compliance audit to assess unauthorized access that may have already occurred.

Reb500 Firmware CVE-2026-2460

HIGH

Privilege Defined With Unsafe Actions (CWE-267)

2026-02-24 cybersecurity@hitachienergy.com

Information Disclosure Reb500 Firmware Hitachienergy

8.1

CVSS 3.1 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as low-privilege REB500 user
Exploit

Connect via DAC protocol
Execution

Bypass directory access controls
Impact

Read and modify unauthorized directory content

Vulnerability Assessment

Weakness	CWE CWE-267 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V8 - Authorization Privilege defined with unsafe actions
Exploitation Conditions	REB500 device with DAC protocol enabled and a valid low-privilege user account with network access to the device.
Impact	CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitation requires authentication.
Exploit ScenarioDerived	An attacker (requires authentication) could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Improper access control in REB500 firmware allows authenticated users with low privileges to read and modify unauthorized directories via the DAC protocol. An attacker with valid credentials can escalate their file system access beyond their intended permissions, potentially compromising sensitive data or system integrity. No patch is currently available for this vulnerability.

Earlier versions of this analysis (1)

v1 Mar 12, 2026 - 21:55 CVSS 8.1

A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so. [CVSS 8.1 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Affects Reb500 Firmware. A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.1 HIGH

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

DescriptionCVE.org

A vulnerability exists in REB500 for an authenticated user with low-level privileges to access and alter the content of directories by using the DAC protocol that the user is not authorized to do so.

Executive ViewAI

Why It Matters

A high-severity vulnerability in REB500 allows authenticated users with basic system access to view and modify files and directories they should not have permission to access, creating significant risk of unauthorized data exposure and system compromise. This is particularly concerning because any employee or contractor with legitimate system access could exploit this vulnerability, and no patch is currently available from the vendor.

Business Impact: High

Compensating Controls

Implement network segmentation to restrict REB500 access to trusted networks only; disable DAC protocol if not operationally required; enforce strict role-based access controls (RBAC) with principle of least privilege; deploy Web Application Firewall (WAF) rules to block suspicious DAC protocol requests; enable comprehensive audit logging of all DAC protocol activities; conduct regular access reviews to identify and remediate unauthorized privilege escalations; monitor for suspicious file access patterns through SIEM/EDR solutions.

Threat Intelligence Overview

EPSS Score

0.0%

Top 91% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.